remove conditional cargo target and let the env set it externally

circomcompat.nim

@@ -10,17 +10,9 @@ const
   libPath* = libDir/"libcircom_compat_ffi.a"
 
 static:
-  var
+  let
     cmd = "cargo build --release --manifest-path=vendor/circom-compat-ffi/Cargo.toml"
 
-  cmd = when defined(windows):
-    # select the gnu abi, otherwise the default is msvc
-    when defined(i386):
-      cmd & " --target=i686-pc-windows-gnu"
-    else:
-      cmd & " --target=x86_64-pc-windows-gnu"
-  else: cmd
-
   warning "\nBuilding circom compat ffi: "
   warning cmd
   let (output, exitCode) = gorgeEx cmd